Feano louis bodel



(No Model.)

P. L. RODEL.

ADJUSTABLE GRANK FOB. VELOGIPEDBS.

No. 386,896. Patented July 31, 1888.

El a/1 N. Pains miwljho qphur. Washmg'w. o c.

UNITED STATES PATENT OFFICE.

FRANZ LOUIS RGDEL, OF ELSTERBERG, SAXONY, GERMANY.

ADJUSTABLE CRANK FOR VELOCIPEDES.

SPECIFICATION forming part of Letters Patent N 0. 386,896, dated July 31, 1888.

Application filed December 27, 1887. Serial No. 259,033.

(No model.) Patented in Germany August 27, 1887, and in England November 17. 1587,170. 15,800.

To aZZ whom it may concern.-

Be it known that I, FRANZ LoUIs RGDEL, a subject of the King of Saxony, residing at the town of Elsterberg, in the Kingdom of Saxony and Empire of Germany, have invented a new and useful Improvement in Adjustable Cranks for Bicycles and Tricycles, (for which I have received a patent from the Kingdom of Great Britain, No. 15,800, November 17,1887, and for which I made application for a patent of the German Empire August 26, 1887,) of which the following is a specification.

The nature of the invention consists in the details of construction and combination, substantially as illustrated in the drawings, hereinafter described, eventually pointed out in the claim.

Figure 1 is a front view of my newly-invented adjustable crank. Fig. 2 is asectional view illustrating the same as contracted to its shorter length of adjustment. Fig. 3 is an other sectional view illustrating the same as extended to its longest length of adjustment.

The shaft of the driving-wheel is designated bya. Upon thisis rigidly fastened the crankarm b. The outside of this arm is constructed with a guide, 0, and is formed with a projection, 8, in which is a cylindrical hole, 8. The axle Z of the pedal is supported by the adjustable piece (1 i m hg. The cylindrical shank d of this piece is adapted to move in the hole 8, and the bodyt' to slide in the guide 0.

p is a sliding pin movable in the socket 12, whose motion is controlled by the resilience of the spring 0.

g and h are extensions ofthe hub, in which is mounted the shaft 1 of the pedalsf.

t is apawl on which works the spring 2. This spring and pawl are attached, as illustrated, to the rigid arm b, the whole device to be as illustrated in the drawings.

If the crank be in the short adjustment represented in Fig. 2 and the operator desires to lengthen it, the crank is brought into such a position that the projection It will stand upward. The operator then presses on this projection with his foot. This causes the part d t m h g to slip away from the axle a and the inclined surface It to impinge upon the surface of the pinp and push the pin backward in the socket it against the spring 0, which spring bends more and more as the pin is pressed against it. At the same time the curve 10 begins to move under the pawl t, pressing it against the spring 2, which is bent more and more. This is continued until the pawltfalls into the curve 22, the inclined surface 6 passes the pin 19, the end at impinges upon the pin 1, and the parts have assumed the positions illustrated in Fig. 3; but if the crank be in the position illustrated in Fig. 3 and it is desired to change it to a shorter adjustment, the projection g is turned upward and pressed by the foot of the operator. Then the reverse of the motion just described takes place until the parts assume the positions represented in Figs. 1 and 2.

What I claim as my invention, and desire to secure by Letters Patent, is-

The combination, with the shaft a and the arm I), mounted upon said shaft, having the guide 0, having the socket n, the projection s, the hole 8, the pinp, the spring 0, the pawl t, the spring 2, and the pin r, of the adjustable piece 01 i m g h, movable and adjustablein the hole 8', and the guide 0, having curves to and 12, adapted to the pawl t, having inclined surfaces adaptcd to the pin 1) and supporting the shaft 1 of the pedalf, all substantially as and for the purpose set forth.

In witness whereof I hereunto set my hand in presence of two witnesses.

FRANZ LOUIS RODEL.

Witnesses:

HERMANN GOTTFRIED RIEDEL,

J OHAN HEINRICH OHITZ. 

